Shock absorber for use on walking beams of drill rigs



SHOCK'ABS ORBER FOR USE ON WALKING BEAMS 0F DRILL RIGS Filed Sept. 14,1942 2 Sheets-Sheet l A TTORNEYS.

Feb. 23, 1943. A. SHACKLVETTE SHOCK ABSORBER FOR USE ON WALKING BEAMS 0FDRILL RIGS Filed Sept-14, 1942 2 Sheets-Sheet 2 Awe/'2 Jzwcz'zezzeINVENTOR.

ATTORNEYS.

Patented F eb. 23, 194-3 SHOCK ABSORBER FOR USE ON WALKING BEAMS OFDRILL RIGS Albert Shacklette, Jeffersontown, Ky.

Application September 14, 1942, Serial No. 458,286

2 Claims.

This invention relates to well drilling rigs, the primary object of theinvention being to provide a rig having means to absorb the shocks andjars usually directed thereto, during the drilling operation of the rig.

Another important object of the invention is to provide ashock-absorbing device used on the walking beam of a drill rig, whichwill permit the use of a steel cable in connection with relatively smalldrill rigs, thereby appreciably increasing the efliciency of Welldrilling rigs.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of con struction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein described, may be made within thescope of what is claimed, without departing from the spirit of theinvention.

Referring to the drawings:

Figure l is a side elevational view of a, drill rig constructed inaccordance with the invention.

Figure 2 is an enlarged plan view of the shockabsorbing device, formingthe essence of the present invention.

Figure 3 is a longitudinal sectional view through the shock-absorbingdevice.

Figure 4 is a sectional view taken on line 4-4 of Figure 3.

Referring to the drawings in detail, the frame of the drill rig isindicated generally by the reference character 5, and comprises spacedparallel bars 6 and spaced upstanding bars I disposed at the rear end ofthe rig. Connecting the bars 1, is a shaft 8 on which one end of theWalking beam 9 is pivotally mounted, the forward end of the walking beambeing disposed adjacent to the standards I that rise from the forwardend of the rig frame and provide the support for the pulley I! mountedon the shaft l2, carried at the upper ends of the standards 10. Bracebars [3 extend from the side rails 6 and connect with the standards 16at points adjacent to the upper ends thereof, bracing the standards NJ.

The reference character l4 designates the cable drum, on which the cableI is wound, the cable passing over the pulley I6, from where the cableoperates over the pulley I! mounted in bearings carried by the walkingbeam 9. The cable also operates over the pulley l8 which is supported bythe movable section is of the shockabsorber 20. From the pulley 18, thecable oper- II, from where it passes downwardly and connects with thedrill tool 22.

The reference character 23 designates the power wheel, which is operatedthrough any suitable means not shown, the wheel 23 being connected withthe forward end of the walking beam 9, by means of the crank 25 and arm25. Thus it will be seen that as the wheel 23 rotates, the walking beamwill be moved vertically with the result that the cable will be alsomoved vertically operating the drill tool 22, to accomplish its purpose.

The shock-absorbing device comprises a cylindrical body portion 26 thathas one of its ends closed, providing a housing for the fibre and rubbercushioning members 2? that are constructed to exactly fit within theclosed end of the body portion 26.

The opposite end of the body portion is open, and allows the movablemember [9 to move a short distance beyond the open end of the bodyportion. The movable member or section 19 embodies separable members,each of which is provided with a semi-circular end piece 28, the membersI9 being cut-away providing a clearance for the pulley 18, which ismounted on the shaft 29. Thus it will be seen that when thesemi-circular members 28 are placed together in a manner as shown by thedrawings, circular heads are provided for movement within thecylindrical body portion.

Lugs 30 extend from the cylindrical body portion 26, and are formed withopenings for the reception of the bolts 3|, which secure the cylindricalbody portion to the walking beam 9.

From the foregoing it will be seen that due to the construction shownand described, the walking beam will operate to raise and lower thecable and drill tool, and that the sudden jar or shock usuallytransmitted to the drill rig, through the cable, will be absorbed by theshock-absorbing members 21, when the movable section is forced againstthe shock-absorbing members 21.

What is claimed is:

1. A drill rig including a walking beam and drill cable, ashock-absorber comprising a cylindrical body portion closed at one ofits ends, mounted on the walking beam, a sectional member operating inthe cylinder, a pulley held between the sections of the movable memberand over which the cable operates, heads at the ends of the movablemember, and yieldable members disposed between the head at one end ofthe movable member and closed end of the cylinder,

ates under the pulley 2| and then over the pulley and said yieldablemembers adapted to cushion the movements of the movable member and drillcable, during the drilling operation.

2. A drill rig including a walking beam and drill cable, ashock-absorber comprising a cylinder mounted on the walking beam, saidcylinder having a slot in the side thereof, a movable member within thecylinder, a pulley mounted on the movable member and extending throughthe slot,

said drill cable adapted to operate over the pulley, yieldable memberswithin the cylinder and against which one end of the movable memberoperates, cushioning the movements of the movable member and cable,during the drilling operation.

ALBERT SHACKLETTE.

